Raspberry Pi Model B with 512 MB ram. Adjusting memory allocated to GPU with /boot/config.txt with raspBMC
gpu_mem_512=64/128/256...
Linux raspbmc 3.6.7 #1 PREEMPT Tue Nov 20 23:18:55 UTC 2012 armv6l GNU/Linux
pi@raspbmc:~$ cat /proc/cpuinfo
Processor : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS : 531.66
pi@raspbmc:~$ cat /proc/meminfo
MemTotal: 384484 kB
MemFree: 258880 kB
Minor overclock:
pi@raspbmc:~$ cat /boot/config.txt
arm_freq=900
gpu_freq=300
force_turbo=1
disable_overscan=0
gpu_mem_256=128
gpu_mem_512=64
pi@raspbmc:~$ cat /proc/cpuinfo
Processor : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS : 597.60
pi@raspbmc:~$ cat /proc/meminfo
MemTotal: 449508 kB
MemFree: 253256 kB